array(0) {
}
<br />
<b>Warning</b>:  Undefined array key "transaction_id" in <b>C:\xampp\htdocs\tienich\ducanh_callback.php</b> on line <b>4</b><br />
<br />
<b>Warning</b>:  Undefined array key "status" in <b>C:\xampp\htdocs\tienich\ducanh_callback.php</b> on line <b>5</b><br />
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